2323 Chung Hsin Electric & Engineering Corp.

Release Date: July 9, 2026 Statement Date: July 8, 2026 Statement Time: 18:06:10 Company Code: 2323 Company Name: Chung Hsin Electric & Engineering Corp. Subject: Announcement of Disposal of Marketable Securities Relevant Clause: Clause 20 Event Date: July 8, 2026

1. Security Name: Nanya Technology Corporation Common Stock

2. Transaction Date: July 7, 2026 – July 8, 2026

3. Board Approval Date: Not applicable

4. Other Approval Dates: Approval Level: Approved by Chairman July 8, 2026

5. Transaction Quantity, Unit Price, and Total Amount: Quantity (in thousands of shares): 800 Unit Price (NT$): 424.99 Total Transaction Amount (NT$): 339,994,974

6. Gain (or Loss) on Disposal (not applicable for acquisition): Disposal Loss: NT$3,817,158

7. Relationship with the Target Company: None

8. Cumulative Holdings of the Security (including this transaction) to Date – Quantity, Amount, Ownership Percentage, and Restricted Rights (e.g., Pledge Status): Remaining Holdings: 4,096,000 shares, Amount: NT$1,767,772,477 Ownership Percentage: 0.12%, Rights Restrictions: None

9. Proportion of Marketable Securities Investment (including this transaction) under Article 3 of the 'Rules for Handling Acquisitions or Dispositions of Assets by Publicly Issued Companies' to Total Assets and Equity Attributable to Owners of Parent in the Latest Financial Statements, and Amount of Working Capital: Percentage of Total Assets: 84.60% Percentage of Equity Attributable to Owners of Parent: 121.50% Working Capital Amount: NT$8,285,327 thousand

10. Specific Purpose of Acquisition or Disposal: Portfolio Management

11. Dissenting Director’s Opinion on This Transaction: None

12. Whether This Transaction is a Related-Party Transaction: No

13. Counterparty and Its Relationship with the Company: Not applicable

14. Date of Supervisor’s Acknowledgment or Audit Committee’s Approval: Not applicable

15. Previous Date of Material Information Disclosure on the Same Event: Not applicable

16. Other Remarks: On June 30, 2026, authorized traders were granted permission to conduct securities transactions in the centralized market during the third quarter of 2026.